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Please help me fix this cracked wall!

Total rookie here, but I need to make a couple repairs before I move out of this place and don't have any friends IRL who can help with this sort of thing.

First up is a crack I put in the surface of the wall when a kitchen cart fell into the corner. I don't know the name of the material, but as you can see it's a white plastery uneven material with a medium gloss. Beneath that is some kind of metal corner that I hope I need to completely obscure, especially because it's bent up quite a bit.

Forgive my ignorance and feel free to correct me, and I'm sure I can get this done with some clear instructions!

You'll need to mud it first, sand it down smooth and then get some texturing spray from your local home store. Practice with it on a piece of cardboard and when you put it on the wall, make sure you layer it slowly. If you mess up, you can sand it flat again and start over.